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All the Swiss are against grey market, and Rolex particularly so. I can't even sell a new Rolex in my store in Abingdon even though we have two Rolex showrooms. My client would have to go to one of the stores where the stock is held.
The warranties are electronically activated at the store where the watch is. Only then are they valid.
My comment wasn't with buying online but the source of online. ( we sell online, certain brands)
Specifically, what chances are you taking? I know for a fact that Omega and Rolex are happy to deal with watches purchased on the grey market...